Physics Magnetism: Ring Behavior When Switch is Closed

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When the switch is closed, the behavior of the golden ring depends on the position of the rheostat's slide contact. If the contact is kept at A, the resistance decreases, leading to an increase in current, but the ring remains stationary due to the lack of a changing magnetic field. Moving the contact from A to B alters the resistance and current, potentially inducing motion in the ring based on the rate of change of magnetic flux. Oscillating the contact between A and B at 1 Hz creates a varying magnetic field, which can induce an alternating current in the ring, causing it to oscillate. The discussion emphasizes the relationship between resistance, current, and induced electromotive force in determining the ring's motion.
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Homework Statement



http://upload.lsforum.net/users/public/c7843Untitleda235.jpg

when the switch is closed
what happen to the golden ring when the switch is closed? explain

the switch remains closed. what happen to the ring if the slide contact of the rheostat
i) is kept at A
ii) moves from A to B
iii) oscillates to and fro between A and B continuously with 1 Hz ?

explain the aboves

Homework Equations


it is a theorem about induced current

The Attempt at a Solution


i am wondering when it contact at A the resistance decreases, so the current increases of circuit, then y the golden ring remain stationary?
 
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